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Lava may be erupted at a volcano or through a fracture in the crust, on land or underwater, usually at temperatures from 800 to 1,200 °C (1,470 to 2,190 °F). The volcanic rock resulting from subsequent cooling is also often called lava. A lava flow is an outpouring of lava during an effusive eruption.
Unusually hot (>950 °C; >1,740 °F) rhyolite lavas, however, ... Magma that is extruded onto the surface during a volcanic eruption is called lava. Lava cools and ...
Augustine Volcano (Alaska) during its eruptive phase on January 24, 2006. A volcano is commonly defined as a vent or fissure in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface.
Pyroclastic flows sweep down the flanks of Mayon Volcano, Philippines, in 2018. A pyroclastic flow (also known as a pyroclastic density current or a pyroclastic cloud) [1] is a fast-moving current of hot gas and volcanic matter (collectively known as tephra) that flows along the ground away from a volcano at average speeds of 100 km/h (30 m/s; 60 mph) but is capable of reaching speeds up to ...
NORTH OF SYLINGARFELL, Iceland (Reuters) -A volcano in southwestern Iceland erupted on Thursday for the third time since December, spraying streams of lava up to 80 metres (260 feet) into the air ...
Volcanic gases are gases given off by active (or, at times, by dormant) volcanoes. These include gases trapped in cavities in volcanic rocks, dissolved or dissociated gases in magma and lava, or gases emanating from lava, from volcanic craters or vents. Volcanic gases can also be emitted through groundwater heated by volcanic action.
The Yellowstone Caldera formed over 600,000 years ago from the Lava Creek Tuff eruption, ... the event emptied out enough volcanic material to produce the 30-by-40-mile-wide caldera.
Yellowstone is one of the planet's largest volcanic systems, a place where a plume of the Earth's molten core rises up through the solid rock of crust, heating and melting it to form reservoirs of ...